new method to create shorthand name from full Controller name
[FrameworkBundle] fixed implementation of previous merge (refs #5865)
merged branch fabpot/create-controller-names (PR #7843)

This PR was merged into the master branch.

Discussion
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Add a way to create a short controller name (a:b:c) from a fully qualify one (controller::action)

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #5865
| License       | MIT
| Doc PR        | n/a

Working implementation of #5865

Commits
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0795ea8 [FrameworkBundle] fixed implementation of previous merge (refs #5865)
91ebba4 new method to create shorthand name from full Controller name